WO2013137464A1

WO2013137464A1 - Organic el display element comprising optical laminate

Info

Publication number: WO2013137464A1
Application number: PCT/JP2013/057541
Authority: WO
Inventors: 直良山田; 裕介古木; 淳渡部; 誠石黒; 慎平吉田
Original assignee: 富士フイルム株式会社
Priority date: 2012-03-15
Filing date: 2013-03-15
Publication date: 2013-09-19
Also published as: US9588271B2; KR101631399B1; KR20140135739A; JPWO2013137464A1; US20140375935A1; CN104170525A; JP5745686B2; CN104170525B

Abstract

An organic EL display device is provided that exhibits excellent viewing angle characteristics and superior production characteristics. The organic EL display device is provided with at least a polarizer layer, a λ/2 plate, a λ/4 plate, and an organic EL panel in this order, and is characterized in that the in-plane retardation (Re2(550)) of the λ/4 plate at 550 nm satisfies 115≤Re2(550)≤155, and the in-plane retardation (Re1(550)) of the λ/2 plate at 550 nm satisfies Re1(550)=2×Re2(550)±50 nm.

Description

ORGANIC EL DISPLAY ELEMENT HAVING OPTICAL LAMINATE

The present invention relates to an organic electroluminescence (hereinafter referred to as “organic EL”) display device having an optical laminate.

An organic electroluminescence (organic EL) display device is a self-luminous thin display device, and has advantages in display performance such as higher visibility and less viewing angle dependency than a liquid crystal display device. In addition to the advantages that the display can be made lighter and thinner, there is a possibility that a display device having a shape that could not be realized so far can be realized by using a flexible substrate.

The organic EL display device has excellent characteristics as described above. However, since layers with different refractive indexes are laminated on the electrode using a transparent conductive material with a high refractive index such as ITO, or a metal material with a high reflectance is used, external light is reflected at the interface between them and contrast is increased. Reflection and reflection problems may occur due to internal reflection.

Fig. 1 shows a typical configuration of an organic EL element. As shown in FIG. 1, the organic EL display basically has a back electrode 2, an organic layer 3 including two or three layers including a light emitting layer, and a transparent electrode or a semitransparent electrode. 4. A structure in which a transparent substrate 5 is laminated, and holes injected from the back electrode 2 and electrons injected from the transparent electrode 4 are recombined in the organic layer 3 to excite a fluorescent substance or the like. It emits light. The light emitted from the organic layer 3 is reflected directly or by the back electrode 2 formed of aluminum or the like and is emitted from the transparent substrate 5. In order to realize color display, the organic layer 3 has a structure in which pixels of a total of three colors of red, green, and blue, or a total of four colors added with white are arranged in a matrix, A structure in which the organic layer 3 is made of an element that emits white light and obtains a color display by combining a color filter has been proposed (for example, Patent Documents 1 and 2).

As described above, since the organic EL element has a structure in which layers having different refractive indexes are stacked or a structure using a metal electrode, external light is reflected at the interface of each layer, which may cause problems such as a decrease in contrast and reflection. is there.

In order to suppress the adverse effects of external light reflection as described above, an absorption linear polarizing plate, a circular polarizing plate made of a λ / 4 plate (for example,

Patent Documents

3, 4, 5, and 6), an absorption linear polarizing plate, A proposal has been made to use a circularly polarizing plate comprising a λ / 2 plate and a λ / 4 plate (for example, Patent Document 7).

Further, the circularly polarizing plate is used not only for organic EL display devices but also for many applications such as reflective LCDs, transflective LCDs, transparent displays, brightness enhancement films, optical disk pickups and PS conversion elements.

Japanese Patent No. 4630884 Japanese Unexamined Patent Publication No. 2011-59611 Japanese Unexamined Patent Publication No. 7-142170 Japanese Laid-Open Patent Publication No. 9-127858 Japanese Unexamined Patent Publication No. 2003-332068 Japanese Unexamined Patent Publication No. 2002-98833 Japanese Laid-Open Patent Publication No. 2007-188033 Japanese Unexamined Patent Publication No. 2001-4837 Japanese Unexamined Patent Publication No. 2004-53841 Japanese Patent Laid-Open No. 9-292522 Japanese Unexamined Patent Publication No. 2000-56310 Japanese Unexamined Patent Publication No. 2000-104073 Japanese Unexamined Patent Publication No. 2000-105316 Japanese Unexamined Patent Publication No. 2007-108732

The above λ / 4 plate or λ / 2 plate needs to have its slow axis set at an angle that is neither parallel nor orthogonal to the absorption axis of the polarizing plate. Currently, most λ / 4 plates and λ / 2 plates used in organic EL display devices are retardation plates that exhibit optical anisotropy by stretching a polymer film. The phase axis direction generally corresponds to the longitudinal direction or the lateral direction of a sheet-like or roll-like film. On the other hand, since the absorption axis of the polarizing plate is parallel to the longitudinal direction of the roll film, in order to bond the λ / 4 plate or λ / 2 plate and the polarizing plate, each film is cut and the obtained chip Must be pasted together so as to have a predetermined angle. When trying to manufacture a laminate of a retardation plate and a polarizing plate by chip bonding, an adhesive coating process, chip cutting or chip bonding process is required, and the process is complicated and the quality due to axial misalignment There is a problem that the reduction easily occurs, the yield decreases, the cost increases, and foreign matters are likely to be mixed.

Also, there is a problem that a polymer film having a slow axis in an oblique direction of a sheet-like or roll-like film is very difficult to produce.

Also, the polymer film has a problem that the phase difference changes with changes in temperature and humidity, and the desired performance may not be obtained.

In order to solve such a problem, a coating liquid containing a discotic liquid crystal compound or a rod-shaped liquid crystal compound is applied to a roll-shaped film, and optical anisotropy is expressed by orienting in a predetermined direction. A phase difference plate having a slow axis at an angle that is neither parallel nor orthogonal is proposed (Patent Documents 8 and 9). In addition, there is disclosed a retardation plate whose orientation is fixed so that the disc surface of discotic liquid crystal molecules is substantially perpendicular to the film surface (Patent Documents 10, 11, 12, 13, and 14).

However, the circularly polarizing plate prepared in accordance with the above-mentioned patent document has a problem in that reflection when observed from an oblique direction cannot be sufficiently reduced, and viewing angle characteristics may be deteriorated.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an organic EL display device having excellent viewing angle characteristics with high productivity.

[1] An organic EL display device including at least a polarizer layer, a λ / 2 plate, a λ / 4 plate, and an organic EL panel in this order, and an in-plane retardation Re2 at 550 nm of the λ / 4 plate (550) is 115 ≦ Re2 (550) ≦ 155
And the in-plane retardation Re1 (550) at 550 nm of the λ / 2 plate is Re1 (550) = 2 × Re2 (550) ± 50 nm
An organic EL display device satisfying the requirements.
[2] The angle formed by the absorption axis direction of the polarizer layer and the slow axis direction of the λ / 2 plate is −30 ° × Rth1 (550) / | Rth1 (550) | + 45 ° ± 8 °
And the angle formed by the absorption axis direction of the polarizer layer and the slow axis direction of the λ / 4 plate is 30 ° × Rth1 (550) / | Rth1 (550) | + 45 ° ± 8 °
The organic EL display device according to [1], which is a range of [1]. However, Rth1 (550) is retardation in the thickness direction at a wavelength of 550 nm of the λ / 2 plate.
[3] The organic EL display device according to [2], wherein at least one of the λ / 2 plate and the λ / 4 plate is a layer containing either a discotic liquid crystal compound or a rod-like liquid crystal compound.
[4] The sum of Rth at a wavelength of 550 nm of all the layers between the polarizer layer and the λ / 2 plate, including the λ / 2 plate but not the polarizer layer, is −150 nm to Rth of all the layers that are 150 nm and between the λ / 2 plate and the λ / 4 plate, including the λ / 4 plate but not the λ / 2 plate, at a wavelength of 550 nm [3] The organic EL display device according to [3], which has a total sum of −120 nm to 120 nm.
[5] At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, and a second transparent support layer composed of one or more layers And a λ / 4 plate composed of a layer containing a discotic liquid crystal compound, and an organic EL panel in this order, wherein the first transparent support layer has an Rth of −30 nm to 550 nm at a wavelength of 550 nm [4] The organic EL display device according to [4], wherein the second transparent support layer has an Rth of 0 nm to 200 nm at a wavelength of 550 nm.

[6] A λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a transparent support layer comprising one or more layers, and a λ / 4 plate comprising a layer containing a discotic liquid crystal compound, An organic EL display device comprising an organic EL panel in this order, wherein the Rth of the transparent support layer at a wavelength of 550 nm is -10 nm to 140 nm.
[7] At least a polarizer layer, a transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, and a λ / 4 plate composed of a layer containing a discotic liquid crystal compound, An organic EL display device comprising an organic EL panel in this order, wherein the Rth of the transparent support layer at a wavelength of 550 nm is −30 nm to 30 nm.
[8] A λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a λ / 4 plate comprising a layer containing a discotic liquid crystal compound, and a transparent support layer comprising one or more layers, An organic EL display device comprising an organic EL panel in this order, wherein the transparent support layer has an Rth of -10 nm to 100 nm at a wavelength of 550 nm [4].
[9] At least a polarizer layer, a transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, a λ / 4 plate composed of a layer containing a rod-like liquid crystal compound, and organic [4] The organic EL display device according to [4], which is an optical laminate comprising an EL panel in this order, wherein Rth of the transparent support layer at a wavelength of 550 nm is −50 nm to 150 nm.
[10] A λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a transparent support layer comprising one or more layers, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, and organic [4] The organic EL display device according to [4], which is an optical laminate comprising an EL panel in this order, wherein Rth of the transparent support layer at a wavelength of 550 nm is −90 nm to 50 nm.

[11] A λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, a transparent support layer comprising one or more layers, and an organic An organic EL display device comprising an EL panel in this order, wherein the Rth of the transparent support layer at a wavelength of 550 nm is −110 nm to 40 nm.
[12] At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, and a second transparent support layer composed of one or more layers And a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, and an organic EL panel in this order, wherein the Rth of the first transparent support layer at a wavelength of 550 nm is −40 nm to 140 nm. The organic EL display device according to [4], wherein Rth of the second transparent support layer at a wavelength of 550 nm is −70 nm to 70 nm.
[13] At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, and λ / 4 composed of a layer containing a discotic liquid crystal compound. An organic EL display device comprising a plate, a second transparent support layer composed of one or more layers, and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is from −50 nm [4] The organic EL display device according to [4], wherein the second transparent support layer has an Rth of 0 nm to 100 nm at a wavelength of 550 nm.
[14] At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, and a λ / 4 plate composed of a layer containing a rod-like liquid crystal compound An organic EL display device comprising, in this order, a second transparent support layer composed of one or more layers, and an organic EL panel, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −40 nm to 140 nm The organic EL display device according to [4], wherein Rth of the second transparent support layer at a wavelength of 550 nm is −100 nm to 40 nm.
[15] A λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a first transparent support layer comprising one or more layers, and a λ / 4 comprising a layer containing a discotic liquid crystal compound. An organic EL display device comprising a plate, a second transparent support layer composed of one or more layers, and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −40 nm to [4] The organic EL display device according to [4], wherein the second transparent support layer has an Rth of -50 nm to 100 nm at a wavelength of 550 nm.

[16] A λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a first transparent support layer comprising at least one layer, and a layer comprising a rod-like liquid crystal compound An organic EL display device comprising, in this order, a second transparent support layer composed of one or more layers, and an organic EL panel, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −70 nm to 100 nm. The organic EL display device according to [4], wherein Rth of the second transparent support layer at a wavelength of 550 nm is −110 nm to 40 nm.
[17] At least a polarizer layer, a transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-like liquid crystal compound, a λ / 4 plate composed of a layer containing a discotic liquid crystal compound, and organic An organic EL display device comprising an EL panel in this order, wherein the Rth of the transparent support layer at a wavelength of 550 nm is −150 nm to 50 nm.
[18] At least a polarizer layer, a transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-like liquid crystal compound, a λ / 4 plate composed of a layer containing a rod-like liquid crystal compound, and an organic EL The organic EL display device according to [4], wherein the transparent support layer has an Rth of −30 nm to 30 nm at a wavelength of 550 nm.
[19] A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a transparent support layer comprising one or more layers, a λ / 4 plate comprising a layer containing a discotic liquid crystal compound, and organic An organic EL display device comprising an EL panel in this order, wherein the Rth of the transparent support layer at a wavelength of 550 nm is -50 nm to 90 nm.
[20] A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a transparent support layer comprising one or more layers, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, and an organic EL The organic EL display device according to [4], wherein the transparent support layer has an Rth of −140 nm to 10 nm at a wavelength of 550 nm.

[21] A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a λ / 4 plate comprising a layer containing a discotic liquid crystal compound, a transparent support layer comprising one or more layers, an organic An organic EL display device comprising an EL panel in this order, wherein the Rth of the transparent support layer at a wavelength of 550 nm is −50 nm to 110 nm.
[22] A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, a transparent support layer comprising one or more layers, and an organic EL The organic EL display device according to [4], wherein the transparent support layer has an Rth of -100 nm to 10 nm at a wavelength of 550 nm.
[23] At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-like liquid crystal compound, and a second transparent support layer composed of one or more layers An organic EL display device comprising a λ / 4 plate composed of a layer containing a discotic liquid crystal compound and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −140 nm to 40 nm. The organic EL display device according to [4], wherein Rth of the second transparent support layer at a wavelength of 550 nm is −70 nm to 70 nm.
[24] At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-like liquid crystal compound, and a second transparent support layer composed of one or more layers An organic EL display device comprising a λ / 4 plate composed of a layer containing a rod-like liquid crystal compound and an organic EL panel in this order, wherein the Rth of the first transparent support layer at a wavelength of 550 nm is −150 nm to 40 nm. The organic EL display device according to [4], wherein the second transparent support layer has an Rth of −200 nm to 0 nm at a wavelength of 550 nm.
[25] A λ / 4 plate comprising at least a polarizer layer, a first transparent support layer comprising one or more layers, a λ / 2 plate comprising a rod-like liquid crystal compound layer, and a layer comprising a discotic liquid crystal compound And an organic EL display device comprising, in this order, a second transparent support layer composed of one or more layers, and an organic EL panel, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −140 nm to 40 nm. [4] The organic EL display device according to [4], wherein Rth of the second transparent support layer at a wavelength of 550 nm is −40 nm to 100 nm.

[26] At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-like liquid crystal compound, and a λ / 4 plate composed of a layer containing a rod-like liquid crystal compound; An organic EL display device comprising a second transparent support layer composed of one or more layers and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −120 nm to 40 nm The organic EL display device according to [4], wherein the second transparent support layer has an Rth of -100 nm to 0 nm at a wavelength of 550 nm.
[27] A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a first transparent support layer comprising one or more layers, and a λ / 4 plate comprising a layer containing a discotic liquid crystal compound An organic EL display device comprising, in this order, a second transparent support layer composed of one or more layers, and an organic EL panel, wherein Rth at a wavelength of 550 nm of the first transparent support layer is from −100 nm to 80 nm [4] The organic EL display device according to [4], wherein Rth of the second transparent support layer at a wavelength of 550 nm is −40 nm to 100 nm.
[28] A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a first transparent support layer comprising one or more layers, and a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound; An organic EL display device comprising a second transparent support layer composed of one or more layers and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −150 nm to 40 nm The organic EL display device according to [4], wherein the second transparent support layer has an Rth of -100 nm to 50 nm at a wavelength of 550 nm.
[29] The organic EL display device according to any one of [1] to [28], comprising at least one cellulose acylate layer between the polarizer layer and the organic EL panel.

In the present specification, the description “A to B” means “A to B”. Moreover, organic EL means organic electroluminescence.
In the present specification, the “slow axis” means a direction in which the refractive index is maximum in the plane, and the measurement wavelength of the refractive index is a visible light region (λ = 550 nm) unless otherwise specified. ).

According to the present invention, the reflection of the reflected image due to the internal reflection of the organic EL element is sufficiently reduced both in the front direction and in the oblique direction, and an organic EL display device excellent in display performance, productivity, and durability is provided. Can be provided.

FIG. 2 is a schematic diagram of an organic EL display device.

The present invention is described in detail below.
In the description of this embodiment, the term “polarizing plate” is used to include both a long polarizing plate and a polarizing plate cut into a size incorporated in a display device unless otherwise specified. Yes. Here, “cutting” includes “punching” and “cutting out”. In the description of the present embodiment, “polarizing film” and “polarizing plate” are distinguished from each other. However, “polarizing plate” is a laminate having a transparent protective film that protects the polarizing film on at least one surface of the “polarizing film”. It shall mean the body.

In this specification, Re (λ) and Rth (λ) represent in-plane retardation and retardation in the thickness direction at the wavelength λ, respectively. Re (λ) is measured with KOBRA 21ADH or WR (manufactured by Oji Scientific Instruments Co., Ltd.) by making light having a wavelength of λ nm incident in the normal direction of the film. In selecting the measurement wavelength λnm, the wavelength selection filter can be exchanged manually, or the measurement value can be converted by a program or the like. When the film to be measured is represented by a uniaxial or biaxial refractive index ellipsoid, Rth (λ) is calculated by the following method.
Rth (λ) is the film surface when Re (λ) is used and the in-plane slow axis (determined by KOBRA 21ADH or WR) is the tilt axis (rotation axis) (if there is no slow axis) Measurement is performed at a total of 6 points by injecting light of wavelength λ nm from each inclined direction in steps of 10 degrees from the normal direction to 50 ° on one side with respect to the film normal direction (with any rotation direction as the rotation axis). Then, KOBRA 21ADH or WR is calculated based on the measured retardation value, the assumed value of the average refractive index, and the input film thickness value. In the above case, in the case of a film having a direction in which the retardation value is zero at a certain tilt angle with the in-plane slow axis from the normal direction as the rotation axis, retardation at a tilt angle larger than the tilt angle. The value is calculated by KOBRA 21ADH or WR after changing its sign to negative. The retardation value is measured from two inclined directions with the slow axis as the tilt axis (rotation axis) (if there is no slow axis, the arbitrary direction in the film plane is the rotation axis). Rth can also be calculated from the following formula (A) and formula (III) based on the value, the assumed value of the average refractive index, and the input film thickness value.

・・・・・・ Formula (A)
Note that Re (θ) represents a retardation value in a direction inclined by an angle θ from the normal direction. In the formula (A), nx represents the refractive index in the slow axis direction in the plane, ny represents the refractive index in the direction orthogonal to nx in the plane, and nz is the direction orthogonal to nx and ny. Represents the refractive index. d represents a film thickness.
Rth = ((nx + ny) / 2−nz) × d (formula (III))

When the film to be measured is a film that cannot be expressed by a uniaxial or biaxial refractive index ellipsoid, that is, a film having no so-called optical axis, Rth (λ) is calculated by the following method. Rth (λ) is from −50 ° to the normal direction of the film, with Re (λ) being an in-plane slow axis (determined by KOBRA 21ADH or WR) as an inclination axis (rotation axis). Measured at 11 points by making light of wavelength λ nm incident in 10 ° steps up to + 50 °, and based on the measured retardation value, average refractive index assumption value and input film thickness value. Calculated by KOBRA 21ADH or WR. Moreover, in said measurement, the value of the catalog of a polymer handbook (John WILEY & SONS, INC) and various optical films can be used for the assumed value of average refractive index. If the average refractive index is not known, it can be measured with an Abbe refractometer. The average refractive index values of main optical films are exemplified below: cellulose acylate (1.48), cycloolefin polymer (1.52), polycarbonate (1.59), polymethyl methacrylate (1.49), Polystyrene (1.59). By inputting these assumed values of average refractive index and film thickness, KOBRA 21ADH or WR calculates nx, ny, and nz. Nz = (nx−nz) / (nx−ny) is further calculated from the calculated nx, ny, and nz.

Hereinafter, various materials and manufacturing methods used for manufacturing the organic EL display device of the present invention will be described in detail. In addition, in this specification, an optical film is synonymous with an optically anisotropic layer.

[Optically anisotropic layer]
Hereinafter, the optically anisotropic layer that can be used in the present invention including the λ / 2 plate and the λ / 4 plate will be described.

The λ / 4 plate used in the present invention may be an optically anisotropic support having the desired λ / 4 function by itself, or an optically anisotropic layer on a support made of a polymer film. Etc. may be included. That is, in the latter case, a desired λ / 4 function is provided by laminating another layer on the support. The constituent material of the optically anisotropic layer is not particularly limited, and may be a layer formed from a composition containing a liquid crystalline compound and exhibiting optical anisotropy expressed by molecular orientation of the liquid crystalline compound. The polymer film may be a layer having optical anisotropy developed by orienting a polymer in the film and may have both layers. That is, it can be constituted by one or two or more biaxial films, or can be constituted by combining two or more uniaxial films such as a combination of a C plate and an A plate. Of course, it can also be configured by combining one or more biaxial films and one or more uniaxial films.
Here, “λ / 4 plate” means that in-plane retardation Re (λ) at a specific wavelength λnm is Re (λ) = λ / 4.
An optically anisotropic layer satisfying the above. The above equation may be achieved at any wavelength in the visible light range (for example, 550 nm), but the in-plane retardation Re (550) at a wavelength of 550 nm is 115 nm ≦ Re (550) ≦ 155 nm.
The thickness is preferably 120 nm to 145 nm. Within this range, it is preferable because the leakage of reflected light can be reduced to an invisible level when combined with a λ / 2 plate described later.

The λ / 2 plate used in the present invention may be an optically anisotropic support having the desired λ / 2 function by itself, or an optically anisotropic layer on a support made of a polymer film. Etc. may be included. That is, in the latter case, a desired λ / 2 function is provided by laminating another layer on the support. The constituent material of the optically anisotropic layer is not particularly limited, and may be a layer formed from a composition containing a liquid crystalline compound and exhibiting optical anisotropy expressed by molecular orientation of the liquid crystalline compound. The polymer film may be a layer having optical anisotropy developed by orienting a polymer in the film and may have both layers. That is, it can be constituted by one or two or more biaxial films, or can be constituted by combining two or more uniaxial films such as a combination of a C plate and an A plate. Of course, it can also be configured by combining one or more biaxial films and one or more uniaxial films.
Here, “λ / 2 plate” means that the in-plane retardation Re (λ) at a specific wavelength λnm is Re (λ) = λ / 2.
An optically anisotropic layer satisfying the above. The above equation may be achieved at any wavelength in the visible light range (for example, 550 nm). Further, in the present invention, the in-plane retardation Re1 of the λ / 2 plate is set to be substantially twice the in-plane retardation Re2 of the λ / 4 plate. Here, “Retardation is substantially doubled”
Re1 = 2 × Re2 ± 50 nm
It means that. However,
Re1 = 2 × Re2 ± 20 nm
More preferably,
Re1 = 2 × Re2 ± 10 nm
More preferably. The above equation may be achieved at any wavelength in the visible light range, but is preferably achieved at a wavelength of 550 nm. This range is preferable because it can reduce the leakage of reflected light to a level where it is not visually recognized when combined with the λ / 4 plate.

When Rth at a wavelength of 550 nm of the λ / 2 plate is negative, the angle formed by the slow axis direction of the λ / 2 plate and the absorption axis direction of the polarizer layer is 75 ° ± 8 °. The range is preferably 75 ° ± 6 °, more preferably 75 ° ± 3 °. Further, at this time, the angle formed by the slow axis direction of the λ / 4 plate and the absorption axis direction of the polarizer layer is preferably in the range of 15 ° ± 8 °, and is in the range of 15 ° ± 6 °. More preferably, the range is 15 ° ± 3 °. The above range is preferable because light leakage of reflected light can be reduced to a level where it is not visually recognized.

When Rth at a wavelength of 550 nm of the λ / 2 plate is positive, the angle formed by the slow axis direction of the λ / 2 plate and the absorption axis direction of the polarizer layer is 15 ° ± 8 °. The range is preferably 15 ° ± 6 °, more preferably 15 ° ± 3 °. Further, at this time, an angle formed between the slow axis direction of the λ / 4 plate and the absorption axis direction of the polarizer layer is preferably in the range of 75 ° ± 8 °, and is in the range of 75 ° ± 6 °. More preferably, the range is 75 ° ± 3 °. The above range is preferable because light leakage of reflected light can be reduced to a level where it is not visually recognized.

The material for the optically anisotropic support used in the present invention is not particularly limited. Various polymer films such as cellulose acylate, polycarbonate polymer, polyester polymer such as polyethylene terephthalate and polyethylene naphthalate, acrylic polymer such as polymethyl methacrylate, polystyrene, acrylonitrile / styrene copolymer (AS resin), etc. Styrene polymers and the like can be used. Polyolefins such as polyethylene and polypropylene, polyolefin polymers such as ethylene / propylene copolymers, vinyl chloride polymers, amide polymers such as nylon and aromatic polyamide, imide polymers, sulfone polymers, polyethersulfone polymers , Polyether ether ketone polymer, polyphenylene sulfide polymer, vinylidene chloride polymer, vinyl alcohol polymer, vinyl butyral polymer, arylate polymer, polyoxymethylene polymer, epoxy polymer, or polymer mixed with the above-mentioned polymers One or more polymers can be selected from the above and used as the main component to produce a polymer film, which can be used for the production of optical films in a combination that satisfies the above characteristics. That.

When the λ / 2 plate and the λ / 4 plate are a laminate of a polymer film (transparent support) and an optically anisotropic layer, the optically anisotropic layer was formed from a composition containing a liquid crystalline compound. It is preferable that at least one layer is included. That is, it is preferably a laminate of a polymer film (transparent support) and an optically anisotropic layer formed from a composition containing a liquid crystal compound. For the transparent support, a polymer film having a small optical anisotropy may be used, or a polymer film exhibiting an optical anisotropy by stretching or the like may be used. The support preferably has a light transmittance of 80% or more.

[Optically Anisotropic Layer Containing Liquid Crystalline Compound]
The type of liquid crystalline compound used for forming the optically anisotropic layer that the λ / 2 plate and the λ / 4 plate may have is not particularly limited. For example, after forming a low molecular liquid crystalline compound in a nematic alignment in a liquid crystal state, an optically anisotropic layer obtained by fixing by photocrosslinking or thermal crosslinking, or after forming a polymer liquid crystalline compound in a nematic alignment in a liquid crystal state, An optically anisotropic layer obtained by fixing the orientation by cooling can also be used. In the present invention, even when a liquid crystalline compound is used for the optically anisotropic layer, the optically anisotropic layer is a layer formed by fixing the liquid crystalline compound by polymerization or the like. After that, it is no longer necessary to show liquid crystallinity. The polymerizable liquid crystal compound may be a polyfunctional polymerizable liquid crystal or a monofunctional polymerizable liquid crystal compound. The liquid crystalline compound may be a discotic liquid crystalline compound or a rod-like liquid crystalline compound.

In general, liquid crystal compounds can be classified into a rod type and a disk type from the shape. In addition, there are low and high molecular types, respectively. Polymer generally refers to a polymer having a degree of polymerization of 100 or more (Polymer Physics / Phase Transition Dynamics, Masao Doi, 2 pages, Iwanami Shoten, 1992). In the present invention, any liquid crystal compound can be used, but a rod-like liquid crystal compound or a disk-like liquid crystal compound is preferably used. Two or more kinds of rod-like liquid crystal compounds, two or more kinds of disk-like liquid crystal compounds, or a mixture of a rod-like liquid crystal compound and a disk-like liquid crystal compound may be used. It is more preferable to use a rod-like liquid crystal compound or a disk-like liquid crystal compound having a reactive group, since at least one of the reactive groups in one liquid crystal molecule is at least one, because temperature change and humidity change can be reduced. Is more preferable. The liquid crystal compound may be a mixture of two or more types, and in that case, at least one preferably has two or more reactive groups.
As the rod-like liquid crystal compound, for example, those described in JP-A-11-513019 and JP-A-2007-279688 can be preferably used. Examples of the discotic liquid crystal compound include JP-A-2007-108732 and JP-A-2007-108732. Although what is described in 2010-244038 can be used preferably, it is not limited to these.

In the optically anisotropic layer, it is preferable that the molecules of the liquid crystal compound are fixed in any alignment state of vertical alignment, horizontal alignment, hybrid alignment, and tilt alignment. In order to produce a retardation plate having a symmetric viewing angle dependency, the disc surface of the discotic liquid crystalline compound is substantially perpendicular to the film surface (optically anisotropic layer surface), or a rod shape It is preferable that the major axis of the liquid crystal compound is substantially horizontal with respect to the film surface (optically anisotropic layer surface). The term “substantially perpendicular to the discotic liquid crystalline compound” means that the average angle between the film surface (optically anisotropic layer surface) and the disc surface of the discotic liquid crystalline compound is in the range of 70 ° to 90 °. Means. 80 ° to 90 ° is more preferable, and 85 ° to 90 ° is still more preferable. That the rod-like liquid crystalline compound is substantially horizontal means that the angle formed by the film surface (optically anisotropic layer surface) and the director of the rod-like liquid crystalline compound is in the range of 0 ° to 20 °. 0 ° to 10 ° is more preferable, and 0 ° to 5 ° is still more preferable.

When the λ / 2 plate and the λ / 4 plate include an optically anisotropic layer containing a liquid crystalline compound, the optically anisotropic layer may consist of only one layer, or two or more layers of optically different layers. A laminate of anisotropic layers may be used.

The optically anisotropic layer comprises a coating liquid containing a liquid crystalline compound such as a rod-like liquid crystalline compound or a discotic liquid crystalline compound, and, if desired, a polymerization initiator, an alignment control agent and other additives described later. It can be formed by coating on top. It is preferable to form an alignment film on a support and apply the coating solution on the surface of the alignment film.

[Alignment film]
In the present invention, it is preferable to align the molecules of the liquid crystal compound by applying the composition to the surface of the alignment film. Since the alignment film has a function of defining the alignment direction of the liquid crystalline compound, it is preferably used for realizing a preferred embodiment of the present invention. However, if the alignment state is fixed after aligning the liquid crystalline compound, the alignment film plays the role, and thus is not necessarily an essential component of the present invention. That is, it is also possible to produce the polarizing plate of the present invention by transferring only the optically anisotropic layer on the alignment film in which the alignment state is fixed onto the polarizing layer or the support.
The alignment film is preferably formed by polymer rubbing treatment.

Examples of the polymer include methacrylate copolymers, styrene copolymers, polyolefins, polyvinyl alcohol and modified polyvinyl alcohol, poly (N-methylol) described in paragraph No. [0022] of JP-A-8-338913, for example. Acrylamide), polyester, polyimide, vinyl acetate copolymer, carboxymethylcellulose, polycarbonate and the like. Silane coupling agents can be used as the polymer. Water-soluble polymers (eg, poly (N-methylolacrylamide), carboxymethylcellulose, gelatin, polyvinyl alcohol, modified polyvinyl alcohol) are preferred, gelatin, polyvinyl alcohol and modified polyvinyl alcohol are more preferred, and polyvinyl alcohol and modified polyvinyl alcohol are most preferred. . The rubbing treatment can be performed by a treatment method widely adopted as a liquid crystal alignment treatment process for LCD. That is, a method of obtaining the orientation by rubbing the surface of the orientation film in a certain direction using paper, gauze, felt, rubber, nylon, polyester fiber or the like can be used. In general, it is carried out by rubbing several times using a cloth in which fibers having a uniform length and thickness are flocked on average.

The said composition is apply | coated to the rubbing process surface of alignment film, and the molecule | numerator of a liquid crystalline compound is aligned. Thereafter, if necessary, the alignment film polymer and the polyfunctional monomer contained in the optically anisotropic layer are reacted, or the alignment film polymer is crosslinked using a crosslinking agent, thereby the optically anisotropic layer. Can be formed.
The thickness of the alignment film is preferably in the range of 0.1 to 10 μm.

[Transparent support (polymer film)]
From this paragraph onward, unless otherwise noted, Re and Rth shall refer to values at a wavelength of 550 nm.

The in-plane retardation (Re) of the transparent support (polymer film) that supports the optically anisotropic layer is preferably 0 to 50 nm, more preferably 0 to 30 nm, and more preferably 0 to 10 nm. Is more preferable. The above range is preferable because light leakage of reflected light can be reduced to a level where it is not visually recognized.

The retardation (Rth) in the thickness direction of the support is preferably selected depending on the combination with the optically anisotropic layer provided on or below the support. Thereby, it is possible to reduce the light leakage of the reflected light and the coloring when observed from an oblique direction.

At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, a second transparent support layer composed of one or more layers, and a disco In the case of an organic EL display device including a λ / 4 plate composed of a layer containing a tick liquid crystal compound and an organic EL panel in this order, Rth of the first transparent support layer is −30 nm to 150 nm. The thickness is preferably 30 nm to 120 nm, more preferably 60 nm to 90 nm. The Rth of the second transparent support layer is preferably 0 nm to 200 nm, more preferably 50 nm to 150 nm, and still more preferably 90 nm to 130 nm.

Further, at least a polarizer layer, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, a transparent support layer composed of one or more layers, a λ / 4 plate composed of a layer containing a discotic liquid crystal compound, and organic In the case of an organic EL display device including an EL panel in this order, Rth of the transparent support layer is preferably −10 nm to 140 nm, more preferably 10 nm to 120 nm, and 40 nm to 80 nm. More preferably.

Further, at least a polarizer layer, a transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, a λ / 4 plate composed of a layer containing a discotic liquid crystal compound, and an organic In the case of an organic EL display device including an EL panel in this order, Rth of the transparent support layer is preferably −30 nm to 30 nm, more preferably −20 nm to 10 nm.

Further, at least a polarizer layer, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, a λ / 4 plate composed of a layer containing a discotic liquid crystal compound, a transparent support layer composed of one or more layers, an organic In the case of an organic EL display device including an EL panel in this order, Rth of the transparent support layer is preferably −10 nm to 100 nm, more preferably 20 nm to 70 nm, and more preferably 30 nm to 60 nm. More preferably.

Further, at least a polarizer layer, a transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, a λ / 4 plate composed of a layer containing a rod-like liquid crystal compound, and an organic EL In the case of an organic EL display device having panels in this order, Rth of the transparent support layer is preferably −50 nm to 150 nm, more preferably −30 nm to 130 nm, and 20 nm to 70 nm. More preferably.

Further, at least a polarizer layer, a λ / 2 plate made of a layer containing a discotic liquid crystal compound, a transparent support layer made of one or more layers, a λ / 4 plate made of a layer containing a rod-like liquid crystal compound, and an organic EL In the case of an organic EL display device including a panel in this order, Rth of the transparent support layer is preferably −90 nm to 50 nm, more preferably −60 nm to 30 nm, and −20 nm to 20 nm. More preferably it is.

Further, at least a polarizer layer, a λ / 2 plate comprising a layer containing a discotic liquid crystal compound, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, a transparent support layer comprising one or more layers, and an organic EL In the case of an organic EL display device having panels in this order, Rth of the transparent support layer is preferably −110 nm to 40 nm, more preferably −90 nm to 20 nm, and −50 nm to −10 nm. More preferably.

Further, at least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, and a second transparent support layer composed of one or more layers In the case of an organic EL display device comprising a λ / 4 plate composed of a layer containing a rod-like liquid crystal compound and an organic EL panel in this order, the Rth of the first transparent support layer is −40 nm to 140 nm. It is preferably 0 nm to 100 nm, more preferably 40 nm to 80 nm. The Rth of the second transparent support layer is preferably −70 nm to 70 nm, more preferably −30 nm to 30 nm.

Further, at least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, and a λ / 4 plate composed of a layer containing a discotic liquid crystal compound When the organic EL display device includes the second transparent support layer composed of one or more layers and the organic EL panel in this order, Rth of the first transparent support layer is −50 nm to 130 nm. It is preferably from −30 nm to 100 nm, and more preferably from 0 nm to 80 nm. The Rth of the second transparent support layer is preferably 0 nm to 100 nm, and more preferably 20 nm to 80 nm.

Further, at least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, and a λ / 4 plate composed of a layer containing a rod-like liquid crystal compound, In the case of an organic EL display device including a second transparent support layer composed of one or more layers and an organic EL panel in this order, Rth of the first transparent support layer is −40 nm to 140 nm. It is preferably -20 nm to 100 nm, more preferably 10 nm to 50 nm. In addition, Rth of the second transparent support layer is preferably from −100 nm to 40 nm, more preferably from −50 nm to 0 nm, and further preferably from −40 nm to −10 nm.

Further, a λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a first transparent support layer comprising one or more layers, and a λ / 4 plate comprising a layer containing a discotic liquid crystal compound. When the organic EL display device includes the second transparent support layer composed of one or more layers and the organic EL panel in this order, Rth of the first transparent support layer is −40 nm to 150 nm. It is preferably from −10 nm to 100 nm, and more preferably from 30 nm to 60 nm. The Rth of the second transparent support layer is preferably −50 nm to 100 nm, more preferably −30 nm to 70 nm, and further preferably 10 nm to 50 nm.

A λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a first transparent support layer comprising one or more layers, and a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound; In the case of an organic EL display device including a second transparent support layer composed of one or more layers and an organic EL panel in this order, Rth of the first transparent support layer is -70 nm to 100 nm. It is preferably -30 nm to 50 nm, more preferably -10 nm to 30 nm. The Rth of the second transparent support layer is preferably −110 nm to 40 nm, more preferably −80 nm to 0 nm, and further preferably −50 nm to 0 nm.

Further, at least a polarizer layer, a transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-like liquid crystal compound, a λ / 4 plate composed of a layer containing a discotic liquid crystal compound, and an organic EL In the case of an organic EL display device including a panel in this order, Rth of the transparent support layer is preferably −150 nm to 50 nm, more preferably −130 nm to 30 nm, and −90 nm to 0 nm. More preferably it is.

Further, at least a polarizer layer, a transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-like liquid crystal compound, a λ / 4 plate composed of a layer containing a rod-like liquid crystal compound, and an organic EL panel In this order, the Rth of the transparent support layer is preferably −30 nm to 30 nm, and more preferably −10 nm to 20 nm.

Further, at least a polarizer layer, a λ / 2 plate made of a layer containing a rod-like liquid crystal compound, a transparent support layer made of one or more layers, a λ / 4 plate made of a layer containing a discotic liquid crystal compound, and an organic EL In the case of an organic EL display device including a panel in this order, Rth of the transparent support layer is preferably −50 nm to 90 nm, more preferably −30 nm to 60 nm, and −10 nm to 10 nm. More preferably it is.

Further, at least a polarizer layer, a λ / 2 plate comprising a layer containing a rod-like liquid crystal compound, a transparent support layer comprising one or more layers, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, and an organic EL panel In this order, the transparent support layer preferably has Rth of −140 nm to 10 nm, more preferably −120 nm to −10 nm, and −80 nm to −50 nm. More preferably.

Further, at least a polarizer layer, a λ / 2 plate comprising a layer containing a rod-like liquid crystal compound, a λ / 4 plate comprising a layer containing a discotic liquid crystal compound, a transparent support layer comprising one or more layers, and an organic EL In the case of an organic EL display device having panels in this order, Rth of the transparent support layer is preferably −50 nm to 110 nm, more preferably −30 nm to 90 nm, and 10 nm to 50 nm. More preferably.

Further, at least a polarizer layer, a λ / 2 plate comprising a layer containing a rod-like liquid crystal compound, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, a transparent support layer comprising one or more layers, and an organic EL panel In this order, the Rth of the transparent support layer is preferably −100 nm to 10 nm, more preferably −80 nm to −20 nm, and −60 nm to −30 nm. More preferably.

Also, at least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-like liquid crystal compound, a second transparent support layer composed of one or more layers, In the case of an organic EL display device including a λ / 4 plate composed of a layer containing a discotic liquid crystal compound and an organic EL panel in this order, Rth of the first transparent support layer is −140 nm to 40 nm. It is preferably -100 nm to 10 nm, more preferably -80 nm to 0 nm. The Rth of the second transparent support layer is preferably −70 nm to 70 nm, more preferably −40 nm to 40 nm.

Also, at least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-like liquid crystal compound, a second transparent support layer composed of one or more layers, In the case of an organic EL display device including a λ / 4 plate composed of a layer containing a rod-like liquid crystal compound and an organic EL panel in this order, Rth of the first transparent support layer is −150 nm to 40 nm. Is more preferable, −120 nm to 0 nm is more preferable, and −100 nm to −50 nm is still more preferable. The Rth of the second transparent support layer is preferably −200 nm to 0 nm, more preferably −150 nm to −50 nm, and further preferably −130 nm to −90 nm.

Further, at least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-like liquid crystal compound, and a λ / 4 plate composed of a layer containing a discotic liquid crystal compound; In the case of an organic EL display device including a second transparent support layer composed of one or more layers and an organic EL panel in this order, Rth of the first transparent support layer is −140 nm to 40 nm. It is preferably -100 nm to 20 nm, more preferably -50 nm to 0 nm. The Rth of the second transparent support layer is preferably −40 nm to 100 nm, more preferably −10 nm to 50 nm, and further preferably 10 nm to 50 nm.

Further, at least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-like liquid crystal compound, and a λ / 4 plate composed of a layer containing a rod-like liquid crystal compound, In the case of an organic EL display device including a second transparent support layer composed of one or more layers and an organic EL panel in this order, Rth of the first transparent support layer is −120 nm to 40 nm. Is more preferable, −100 nm to 30 nm is more preferable, and −70 nm to 0 nm is still more preferable. In addition, Rth of the second transparent support layer is preferably −100 nm to 0 nm, and more preferably −80 nm to −20 nm.

A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a first transparent support layer comprising one or more layers, and a λ / 4 plate comprising a layer containing a discotic liquid crystal compound; In the case of an organic EL display device including a second transparent support layer composed of one or more layers and an organic EL panel in this order, Rth of the first transparent support layer is −100 nm to 80 nm. It is preferably -60 nm to 40 nm, more preferably -30 nm to 20 nm. The Rth of the second transparent support layer is preferably −40 nm to 100 nm, more preferably −10 nm to 70 nm, and further preferably 0 nm to 50 nm.

A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a first transparent support layer comprising one or more layers, and a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound; In the case of an organic EL display device including a second transparent support layer composed of one or more layers and an organic EL panel in this order, Rth of the first transparent support layer is −150 nm to 40 nm. Is preferable, −90 nm to 0 nm is more preferable, and −60 nm to −20 nm is still more preferable. The Rth of the second transparent support layer is preferably from −100 nm to 50 nm, more preferably from −70 nm to 10 nm, and further preferably from −50 nm to −10 nm.

Examples of polymers include cellulose acylate films (for example, cellulose triacetate film, cellulose diacetate film, cellulose acetate butyrate film, cellulose acetate propionate film), polyolefins such as polyethylene and polypropylene, polyethylene terephthalate and polyethylene naphthalate, etc. Polyester resin film, polyethersulfone film, polyacrylic resin film such as polymethyl methacrylate, polyurethane resin film, polyester film, polycarbonate film, polysulfone film, polyether film, polymethylpentene film, polyetherketone film, (Meth) acrylonitrile film, polyolefin, alicyclic structure Polymer (norbornene resin (Arton: trade name, manufactured by JSR Corporation, amorphous polyolefin (ZEONEX: trade name, manufactured by ZEON CORPORATION)), etc. Among them, triacetyl cellulose, polyethylene terephthalate, alicyclic type A polymer having a structure is preferable, and triacetyl cellulose is particularly preferable.

The polymer film is preferably formed by a solvent cast method. As the solvent casting method, a lamination casting method such as a co-casting method, a sequential casting method, or a coating method can also be used. When producing by the co-casting method and the sequential casting method, first, a cellulose acetate solution (dope) for each layer is prepared. In the co-casting method (multi-layer simultaneous casting), a casting dope for each layer (which may be three layers or more) is simultaneously pressed from another slit or the like on a casting support (band or drum). This is a casting method in which the dope is extruded from the casting gies to be cast, and each layer is cast at the same time, peeled off from the support at an appropriate time, and dried to form a film.
In the sequential casting method, the casting dope for the first layer is first extruded from the casting giusa on the casting support, cast, and dried on the second layer without drying or drying. Extrude the casting dope for casting from the casting gieser, cast the dope sequentially to the third layer or more, if necessary, peel it off from the support at an appropriate time, and dry it. This is a casting method for forming a film.
In general, the core layer film is formed into a film by a solution casting method to prepare a coating solution that is applied to the surface layer, and then applied to the film one side at a time or both sides simultaneously using an appropriate coating machine. This is a method of forming a film having a laminated structure by applying and drying a liquid.

The thickness of the transparent support may be about 10 μm to 200 μm, preferably 10 μm to 80 μm, and more preferably 20 μm to 60 μm. The transparent support may be composed of a plurality of laminated layers. The thinner one is preferable for the suppression of external light reflection, but a thickness of 10 μm or more is preferable because the strength of the film becomes good. In order to improve adhesion between the transparent support and the layer (adhesive layer, vertical alignment film or retardation layer) provided thereon, surface treatment (eg, glow discharge treatment, corona discharge treatment, ultraviolet light (UV) ) Treatment, flame treatment). An adhesive layer (undercoat layer) may be provided on the transparent support. The average particle diameter of the transparent support or the long transparent support is 10 to 100 nm in order to provide slippage in the transport process or to prevent the back surface and the surface from sticking after winding. It is preferable to use a polymer layer in which about 5% to 40% of a solid content of inorganic particles are mixed and formed on one side of the support by coating or co-casting with the support.

In the above description, the λ / 2 plate or λ / 4 plate having a laminated structure in which an optically anisotropic layer is provided on a support has been described. However, the present invention is not limited to this mode, and one sheet A λ / 2 plate and a λ / 4 plate may be laminated on one side of the transparent support, or a λ / 2 plate may be laminated on one side of one transparent support, and the other side. A λ / 4 plate may be laminated. Further, the λ / 2 plate or the λ / 4 plate is composed only of a stretched polymer film (optically anisotropic support) alone but a liquid crystal film formed from a composition containing a liquid crystalline compound. Also good. Preferred examples of the liquid crystal film are the same as the preferred examples of the optically anisotropic layer.

The λ / 2 plate and λ / 4 plate are preferably manufactured continuously in the state of a long film. At this time, the slow axis angle of λ / 2 or λ / 4 is preferably 15 ° ± 8 ° or 75 ° ± 8 ° with respect to the longitudinal direction of the long film. In this way, in the production of the optical laminate described later, the longitudinal direction of the long film and the longitudinal direction of the polarizing film can be matched and roll-to-roll bonding can be performed. This makes it possible to manufacture a circularly polarizing plate and an elliptically polarizing plate with high accuracy of the shaft angle and high productivity. In the case where the optically anisotropic layer is formed of a liquid crystalline compound, the angle of the slow axis of the optically anisotropic layer can be adjusted by the rubbing angle. When the λ / 2 plate or the λ / 4 plate is formed from a stretched polymer film (optically anisotropic support), the angle of the slow axis can be adjusted by the stretching direction.

[Ultraviolet absorber]
The organic EL display device of the present invention may contain an ultraviolet absorber in the optically anisotropic layer, the transparent support, or the surface film. By containing the ultraviolet absorber, the optical laminate, the organic EL panel, the liquid crystal panel, and the like can be protected from ultraviolet rays. As the UV absorber, any UV absorber can be used, and any known UV absorber can be used. Among such ultraviolet absorbers, a benzotriazole-based or hydroxyphenyltriazine-based ultraviolet absorber is preferable in order to obtain a high ultraviolet-absorbing property and to obtain an ultraviolet-absorbing ability (ultraviolet-cutting ability) used in an electronic image display device. Moreover, in order to widen the absorption width of ultraviolet rays, two or more ultraviolet absorbers having different maximum absorption wavelengths can be used in combination.

The content of the ultraviolet absorber is usually 20 parts by mass or less, preferably 1 to 20 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin, although it depends on the required ultraviolet transmittance and the absorbance of the ultraviolet absorber. . When there is more content of an ultraviolet absorber than 20 mass parts, while there exists a tendency for the sclerosis | hardenability by the ultraviolet-ray of a curable composition to fall, there also exists a possibility that the visible light transmittance | permeability of an optical film may fall. On the other hand, when the amount is less than 1 part by mass, the ultraviolet absorption of the optical film cannot be sufficiently exhibited.

[Polarizer]
The polarizing plate used in the present invention has a protective film and a polarizing film. As the polarizing film, any of an iodine polarizing film, a dye polarizing film using a dichroic dye, and a polyene polarizing film may be used. The iodine polarizing film and the dye polarizing film are generally produced using a polyvinyl alcohol film. The absorption axis of the polarizing film corresponds to the stretching direction of the film. Accordingly, the polarizing film stretched in the longitudinal direction (transport direction) has an absorption axis parallel to the longitudinal direction, and the polarizing film stretched in the lateral direction (perpendicular to the transport direction) is perpendicular to the longitudinal direction. Has an absorption axis. Moreover, it is preferable to use a cellulose ester film having high optical isotropy as the protective film.

A preferred method for producing a polarizing plate used in the present invention includes a step in which the optical laminate and the polarizing film are successively laminated in a long state. The long polarizing plate is cut in accordance with the screen size of the image display device used.

By using a linear polarizing film as the polarizing film and combining with the optically anisotropic layer or the transparent support layer, a polarizing film integrated optical film functioning as a circularly polarizing plate or an elliptically polarizing plate can be produced with high productivity. .

[Organic electroluminescence display]
The organic electroluminescence display device of the present invention is a display device in which a plurality of organic compound thin films including a light emitting layer or a light emitting layer are formed between a pair of electrodes of an anode and a cathode. A layer, an electron injection layer, an electron transport layer, a protective layer, and the like may be included, and each of these layers may have other functions. Various materials can be used for forming each layer.

The anode supplies holes to a hole injection layer, a hole transport layer, a light emitting layer, and the like, and a metal, an alloy, a metal oxide, an electrically conductive compound, or a mixture thereof can be used. Is a material having a work function of 4 eV or more. Specific examples include conductive metal oxides such as tin oxide, zinc oxide, indium oxide, and indium tin oxide (ITO), or metals such as gold, silver, chromium, and nickel, and these metals and conductive metal oxides. Inorganic conductive materials such as copper iodide and copper sulfide, organic conductive materials such as polyaniline, polythiophene, and polypyrrole, and laminates of these with ITO, preferably conductive metals It is an oxide, and ITO is particularly preferable from the viewpoint of productivity, high conductivity, transparency, and the like. The thickness of the anode can be appropriately selected depending on the material, but is usually preferably in the range of 10 nm to 5 μm, more preferably 50 nm to 1 μm, and further preferably 100 nm to 500 nm.

The substrate is not particularly limited, but is preferably transparent or translucent, and a substrate in which an anode is formed on a substrate such as soda lime glass, non-alkali glass, or transparent resin is usually used. When glass is used, it is preferable to use non-alkali glass as the material in order to reduce ions eluted from the glass. Moreover, when using soda-lime glass, it is preferable to use what gave barrier coatings, such as a silica.

The thickness of the substrate is not particularly limited as long as it is sufficient to maintain the mechanical strength. However, in a mode in which a light scattering film is used on the surface of the display device, character blur tends to occur when the thickness of the substrate on the viewing side is large. The thinner the better. The viewing-side substrate is preferably 0.01 mm to 0.70 mm, more preferably 0.02 to 0.50 mm, and particularly preferably 0.03 to 0.30 mm.

In terms of strength and lifetime of the display device, it is most preferable to use a thin (preferably glass) substrate of 0.03 to 0.30 mm on the viewing side. When the thickness is smaller than 0.30 μm, it is more preferable to improve the strength by coating a polymer on at least one of one side and the end.

Hereinafter, the features of the present invention will be described more specifically with reference to examples and comparative examples. The materials, amounts used, ratios, processing details, processing procedures, and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the specific examples shown below.

(1) Preparation of transparent support Using various known techniques, a transparent support made of cellulose acylate having optical properties described in Tables 1 to 7 below was prepared.

(2) Application of liquid crystalline compound on transparent support (alkali saponification treatment)
One of the transparent supports described above is passed through a dielectric heating roll having a temperature of 60 ° C., the film surface temperature is raised to 40 ° C., and then an alkali solution having the composition shown below is applied to the band surface of the film. Was applied at a coating amount of 14 ml / m ² and transported for 10 seconds under a steam far-infrared heater manufactured by Noritake Company Limited, heated to 110 ° C. Subsequently, 3 ml / m ^{2 of} pure water was applied using the same bar coater. Next, washing with a fountain coater and draining with an air knife were repeated three times, and then transported to a drying zone at 70 ° C. for 10 seconds and dried to prepare an alkali saponified cellulose acylate film.

(Alkaline solution composition)
──────────────────────────────────
Alkaline solution composition (parts by mass)
──────────────────────────────────
Potassium hydroxide 4.7 parts by weight Water 15.8 parts by weight Isopropanol 63.7 parts by weight Surfactant SF-1: C ₁₄ H ₂₉ O (CH ₂ CH ₂ O) ₂₀ H 1.0 part by weight Propylene glycol 14. 8 parts by mass ──────────────────────────────────

(Formation of alignment film)
To the long cellulose acylate film saponified as described above, an alignment film coating solution having the following composition was continuously applied with a # 14 wire bar. Drying was performed with warm air of 60 ° C. for 60 seconds, and further with warm air of 100 ° C. for 120 seconds.

Composition of alignment film coating solution ――――――――――――――――――――――――――――――――――
Denatured polyvinyl alcohol 10 parts by weight Water 371 parts by weight Methanol 119 parts by weight Glutaraldehyde 0.5 parts by weight Photopolymerization initiator (Irgacure 2959, manufactured by Ciba Japan)
0.3 parts by mass ――――――――――――――――――――――――――――――――――

(Formation of optically anisotropic layer containing discotic liquid crystal (DLC) compound)
The alignment film thus prepared was continuously rubbed. At this time, the longitudinal direction of the long film and the transport direction were parallel, and the angle formed by the film longitudinal direction and the rotation axis of the rubbing roller was adjusted to be 15 °, 45 °, or 75 °. .

The coating liquid A containing a discotic liquid crystal compound having the following composition was continuously applied with a wire bar on the prepared alignment film. The conveyance speed (V) of the film was 36 m / min. In order to dry the solvent of the coating solution and to mature the orientation of the discotic liquid crystal compound, the coating liquid was heated with warm air at 120 ° C. for 90 seconds. Subsequently, UV irradiation was performed at 80 ° C. to fix the alignment of the liquid crystal compound. The thickness of the optically anisotropic layer, that is, the liquid crystal compound layer was adjusted so as to be 1.6 μm to 4.0 μm, and various films having Re (550) at 550 nm of 125 nm to 300 nm were obtained.

Composition of coating solution (A) for optically anisotropic layer ―――――――――――――――――――――――――――――――――
91 parts by weight of the following discotic liquid crystal compound (A) 5 parts by weight of the following acrylate monomer (Irgacure 907, manufactured by Ciba Geigy) 3 parts by weight of sensitizer (Kayacure DETX, manufactured by Nippon Kayaku Co., Ltd.) 1 part by mass The following pyridinium salt (A) 0.5 part by mass The following fluoropolymer (FP1) 0.2 part by mass The following fluoropolymer (FP3) 0.1 part by mass Methyl ethyl ketone 189 parts by mass ――――――――――――――――――――――――――――

Acrylate monomer:
Ethylene oxide modified trimethylolpropane triacrylate (V # 360, manufactured by Osaka Organic Chemical Co., Ltd.)

The direction of the slow axis of the produced film was orthogonal to the rotation axis of the rubbing roller. That is, the slow axis was 15 °, 45 °, or 75 ° counterclockwise with respect to the longitudinal direction of the support. The average inclination angle of the disc surface of the discotic liquid crystalline molecules with respect to the film surface was 90 °, and it was confirmed that the discotic liquid crystal was aligned perpendicular to the film surface.

(Formation of optically anisotropic layer containing rod-like liquid crystal (RLC) compound)
In the same manner as the above film, a coating liquid (B) containing a rod-like liquid crystal compound having the following composition was applied to a cellulose acylate film to obtain various films having a Re (550) at 550 nm of 125 nm to 300 nm. The average inclination angle of the long axis of the rod-like liquid crystal compound with respect to the film surface was 0 °, and it was confirmed that the liquid crystal compound was aligned horizontally with respect to the film surface. Further, the angle of the slow axis was orthogonal to the rotation axis of the rubbing roller.

Composition of coating solution (B) for optically anisotropic layer ―――――――――――――――――――――――――――――――――
The following rod-like liquid crystal compound (A) 100 parts by mass Photopolymerization initiator (Irgacure 907, manufactured by Ciba Japan)
3 parts by mass Sensitizer (Kayacure DETX, manufactured by Nippon Kayaku Co., Ltd.) 1 part by mass The above fluoropolymer (FP1) 0.3 part by mass Methyl ethyl ketone 193 parts by mass Cyclohexanone 50 parts by mass ―――――――――――――――――――――――――

Rod-like liquid crystalline compound (A)

(3) Separation and transfer of optically anisotropic layer The optically anisotropic layer formed by the above method is peeled off from the cellulose acylate film, and the optical difference of the separately prepared cellulose acylate film with an optically anisotropic layer is obtained. It stuck together with the adhesive on the anisotropic layer (transfer). Thus, a cellulose acylate film in which two types of optically anisotropic layers having different retardations and slow axes were formed was obtained.

(4) Production of polarizer A polyvinyl alcohol (PVA) film having a thickness of 80 μm is dyed by dipping in an aqueous iodine solution having an iodine concentration of 0.05 mass% at 30 ° C. for 60 seconds, and then boric acid concentration is 4 mass%. While being immersed in an aqueous boric acid solution for 60 seconds, the film was longitudinally stretched 5 times the original length and then dried at 50 ° C. for 4 minutes to obtain a polarizing film having a thickness of 20 μm.

(5) Preparation of Polarizer Protective Film A commercially available cellulose acylate film “TD80UL” (manufactured by FUJIFILM Corporation) was prepared, immersed in an aqueous sodium hydroxide solution at 55 ° C. at 1.5 mol / liter, and then water The sodium hydroxide was thoroughly washed out. Then, after being immersed in a diluted sulfuric acid aqueous solution at 0.005 mol / liter at 35 ° C. for 1 minute, it was immersed in water to sufficiently wash away the diluted sulfuric acid aqueous solution. Finally, the sample was thoroughly dried at 120 ° C.

(6) Preparation of optical laminate (Examples 1 to 135)
A discotic liquid crystal compound (hereinafter referred to as DLC) or a rod-like liquid crystal compound (hereinafter referred to as RLC) was applied to any of the transparent supports described in (1) by the method described in (2) above. Moreover, DLC or RLC was apply | coated by the method of (2) on both surfaces of one transparent support body as needed. Furthermore, if necessary, two different optically anisotropic layers were formed on the transparent support by the method (3) described above. The film thus obtained, one or two or more transparent supports as necessary, and the polarizer of the above (4) were bonded with an adhesive. Finally, the polarizer protective film of the above (5) was bonded to the surface of the polarizer using a polyvinyl adhesive. Thus, various optical laminates shown in Examples 1 to 135 in Tables 1 to 7 below were prepared.

(Example 138)
(Preparation of cellulose ester solution A-1)
The following composition was put into a mixing tank and stirred while heating to dissolve each component to prepare a cellulose ester solution A-1.

Composition of cellulose ester solution A-1 ――――――――――――――――――――――――――――――――――
Cellulose acetate (acetylation degree 2.86) 100 parts by mass Methylene chloride (first solvent) 320 parts by mass Methanol (second solvent) 83 parts by mass 1-butanol (third solvent) 3 parts by mass Triphenyl Phosphate 7.6 parts by mass, biphenyldiphenyl phosphate 3.8 parts by mass ―――――――――――――――――――――――――――――――――

(Preparation of matting agent dispersion B-1)
The following composition was charged into a disperser and stirred to dissolve each component to prepare a matting agent dispersion B-1.

Composition of Matting Agent Dispersion B-1 ――――――――――――――――――――――――――――――――――
・ Silica particle dispersion (average particle size 16 nm)
"AEROSIL R972", manufactured by Nippon Aerosil Co., Ltd.
10.0 parts by mass-72.8 parts by mass of methylene chloride-3.9 parts by mass of methanol-0.5 parts by mass of butanol-10.3 parts by mass of cellulose ester solution A-1 ----- ――――――――――――――――――――――
(Preparation of UV absorber solution C-1)
The following composition was put into another mixing tank and stirred while heating to dissolve each component to prepare an ultraviolet absorber solution C-1.

Composition of UV absorber solution C-1 ――――――――――――――――――――――――――――――――――
UV absorber (UV-1 below) 10.0 parts by weight UV absorber (UV-2 below) 10.0 parts by weight Methylene chloride 55.7 parts by weight Methanol 10 parts by weight Butanol 1.3 parts by weight・ Cellulose ester solution A-1 12.9 parts by mass
―――――――――――――――――――――――――――――――――

(Production of cellulose ester film)
In a mixture of 94.6 parts by mass of cellulose acylate solution A-1 and 1.3 parts by mass of matting agent dispersion B-1, an ultraviolet absorber (UV-1) and an ultraviolet ray per 100 parts by mass of cellulose acylate An ultraviolet absorbent solution C-1 was added so that the amount of the absorbent (UV-2) was 1.0 part by mass, and each component was dissolved by heating and stirring sufficiently to prepare a dope. The obtained dope was heated to 30 ° C., and cast on a mirror surface stainless steel support, which was a drum having a diameter of 3 m, through a casting Giuser. The surface temperature of the support was set to −5 ° C., and the coating width was 1470 mm. The cast dope film was dried by applying a dry air of 34 ° C. at 150 m ³ / min on the drum, and the residual solvent was peeled off from the drum in a state of 150%. During peeling, 15% stretching was performed in the transport direction (longitudinal direction). Thereafter, the film is conveyed while being held by a pin tenter (pin tenter described in FIG. 3 of JP-A-4-1009) at both ends in the width direction (direction perpendicular to the casting direction) and stretched in the width direction. No processing was performed. Furthermore, it dried further by conveying between the rolls of a heat processing apparatus, and manufactured the cellulose acylate film (T1). The produced long cellulose acylate film (T1) had a residual solvent amount of 0.2%, a thickness of 60 μm, and Re and Rth at 550 nm of 0.8 nm and 40 nm, respectively.

(Formation of alignment film)
The produced cellulose acylate film (T1) was subjected to alkali saponification treatment in the same manner as described above. An alignment film coating solution having the following composition was continuously applied thereon with a # 14 wire bar. Drying was performed with warm air of 60 ° C. for 60 seconds, and further with warm air of 100 ° C. for 120 seconds.

Composition of alignment film coating solution ―――――――――――――――――――――――――――――――――
The following modified polyvinyl alcohol 10 parts by mass Water 75 parts by mass Methanol 17 parts by mass Isopropanol 7 parts by mass Photopolymerization initiator (Irgacure 2959, manufactured by Ciba Japan)
0.8 parts by mass ――――――――――――――――――――――――――――――――――

(Formation of optically anisotropic layer containing discotic liquid crystal (DLC) compound)
The alignment film thus prepared was continuously rubbed. At this time, the longitudinal direction of the long film and the conveying direction are parallel, and the angle formed between the longitudinal direction of the film and the rotation axis of the rubbing roller is 75 ° (clockwise) (when the longitudinal direction of the film is 90 °). The rotation axis of the rubbing roller is 15 °).

A coating liquid (C) containing a discotic liquid crystal compound having the following composition was continuously applied on the prepared alignment film with a wire bar of # 5.0. The conveyance speed (V) of the film was 26 m / min. In order to dry the solvent of the coating solution and to mature the orientation of the discotic liquid crystal compound, it was heated with warm air of 115 ° C. for 90 seconds, then heated with warm air of 80 ° C. for 60 seconds, and irradiated with UV at 80 ° C. The alignment of the liquid crystal compound was fixed. The average inclination angle of the disk surface of the DLC compound with respect to the film surface was 90 °, and it was confirmed that the DLC compound was oriented perpendicular to the film surface. Moreover, the angle of the slow axis was parallel to the rotation axis of the rubbing roller, and was 15 ° when the film longitudinal direction was 90 °.

Composition of coating solution (C) for optically anisotropic layer ―――――――――――――――――――――――――――――――――
80 parts by mass of the following discotic liquid crystal compound (B) 20 parts by mass of the following discotic liquid crystal compound (C) 10 parts by mass of the above acrylate monomer (Irgacure 907, manufactured by Ciba Japan) 3 parts by mass of the following 0.9 parts by mass of the following boronic acid-containing compound 0.08 parts by mass The following polymer 0.6 parts by mass The above fluoropolymer (FP1) 0.3 parts by mass Methyl ethyl ketone 183 parts by mass Cyclohexanone 40 parts by mass Department ――――――――――――――――――――――――――――――――――

(Formation of optically anisotropic layer containing rod-like liquid crystal (RLC) compound)
The optically anisotropic layer containing the produced DLC compound was continuously rubbed. At this time, the longitudinal direction of the long film and the transport direction are parallel, and the angle formed between the longitudinal direction of the film and the rotation axis of the rubbing roller is −75 ° (counterclockwise) (the longitudinal direction of the film is 90 °). Then, the rotation axis of the rubbing roller is 165 °).

A coating liquid (D) containing a rod-like liquid crystal compound having the following composition was continuously applied onto the prepared alignment film with a # 2.2 wire bar. The conveyance speed (V) of the film was 26 m / min. In order to dry the solvent of the coating liquid and to mature the orientation of the discotic liquid crystal compound, the coating liquid was heated with warm air of 60 ° C. for 60 seconds and irradiated with UV at 60 ° C. to fix the orientation of the liquid crystal compound. The average inclination angle of the long axis of the rod-like liquid crystal compound with respect to the film surface was 0 °, and it was confirmed that the liquid crystal compound was aligned horizontally with respect to the film surface. Moreover, the angle of the slow axis was orthogonal to the rotation axis of the rubbing roller, and 75 ° when the film longitudinal direction was 90 °.

Composition of coating solution (D) for optically anisotropic layer ―――――――――――――――――――――――――――――――――
The above rod-shaped liquid crystal compound (A) 20 parts by mass The following rod-shaped liquid crystal compound (B) 80 parts by mass Photopolymerization initiator (Irgacure 907, manufactured by Ciba Japan) 3 parts by mass sensitizer (Kayacure DETX, Nippon Kayaku) 1 part by mass The following fluoropolymer (FP4) 0.3 part by mass Methyl ethyl ketone 193 parts by mass Cyclohexanone 50 parts by mass ――――――――――――――――――――― ――――――――――――

As described above, a film (F1) in which an optically anisotropic layer containing a DLC compound and an optically anisotropic layer containing an RLC compound were laminated on a cellulose acylate film was produced. This film was immersed in an aqueous sodium hydroxide solution at 1.5 mol / liter at 55 ° C., and the sodium hydroxide was thoroughly washed away with water. Then, after being immersed in a diluted sulfuric acid aqueous solution at 0.005 mol / liter at 35 ° C. for 1 minute, it was immersed in water to sufficiently wash away the diluted sulfuric acid aqueous solution. Finally, the sample was thoroughly dried at 120 ° C.
A polarizer and a polarizer protective film prepared in the same manner as above were prepared, and the film (F1), the polarizer, and the polarizer protective film were bonded so that the cellulose acylate surface of the film (F1) was in contact with the polarizer. Combined. In this way, an optical laminate of Example 138 was produced.

(Example 139)
The optically anisotropic layer composed of the DLC compound and RLC compound of the film (F1) is peeled off from the cellulose acylate film, and bonded so that the layer composed of the DLC compound is in contact with the surface of the polarizer of (4). The polarizer protective film described in (5) above was bonded to the other surface using a polyvinyl adhesive. In this way, an optical laminate of Example 139 was produced.

(Examples 140 to 143)
A commercially available norbornene-based polymer film “ZEONOR ZF14” (manufactured by Optes Co., Ltd.) is stretched to adjust the film thickness to 50 μm, and a polymer film having Re (550) of 125 nm and Rth (550) of 74 nm is obtained. Obtained. This was bonded to an optically anisotropic layer, a polarizer, and a polarizer protective film in the same manner as in Examples 1 to 135 described above to produce optical laminates shown in Examples 140 to 143.

(Examples 144 to 147)
The polycarbonate type λ / 4 film used in the 3D glasses attached to 55LW5700, which is a 3D-TV made by LG Electronics, is peeled off, and the optically anisotropic layer is peeled off in the same manner as in Examples 1 to 135 described above. Then, the optical laminates shown in Examples 144 to 147 in Table 8 below were prepared by bonding to the polarizer and the polarizer protective film.

(Comparative Examples 1 to 20)
Various optical laminates shown in Comparative Examples 1 to 20 in Tables 9 to 14 below were prepared in the same manner as in Examples 1 to 135 described above.

(Comparative Example 21)
A commercially available norbornene-based polymer film “ZEONOR ZF14” (manufactured by Optes Co., Ltd.) is diagonally stretched to adjust the film thickness to 50 μm, and Re (550) is 125 nm and Rth (550) is 85 nm. Got. This was bonded to a transparent support, a polarizer, and a polarizer protective film in the same manner as in Examples 1 to 135 described above to prepare various optical laminates shown in Comparative Example 21 in Table 15 below.

(7) Mounting on organic EL elements and evaluation of display performance (Mounting on display device)
The GALAXY SII manufactured by SAMSUNG equipped with an organic EL panel was disassembled, the circularly polarizing plate was peeled off, and the optical laminates of Examples and Comparative Examples shown in Tables 1 to 15 below were bonded to produce a display device. .

(Evaluation of display performance)
About the produced organic EL display apparatus, visibility and display quality were evaluated under bright light.
The display device displayed white, black, and images, and the reflected light was observed when a fluorescent lamp was projected from the front and a polar angle of 45 degrees. Compared with the front, the display quality at a polar angle of 45 degrees was evaluated according to the following criteria.
4: Coloration is not visually recognized at all. (Acceptable)
3: Although slight color difference is visible, very slight (allowable)
2: Although the color difference is visually recognized, the reflected light is small and there is no problem in use. (Acceptable)
1: A color difference is visually recognized and a lot of reflected light is unacceptable.

The evaluation results are shown in Tables 1 to 15 below.
The absorption axis angle and slow axis angle shown in Tables 1 to 15 below were set to 0 ° as the transmission axis angle of the polarizer, and positive when viewed clockwise from the viewing side of the organic EL panel. However, the evaluation results shown in Tables 1 to 15 below do not change even when the definition that the clockwise direction is negative is used.
Moreover, the transmission axis of the polarizer can be bonded to the organic EL panel at an arbitrary angle.

The organic EL display devices of Examples 1 to 147, which are the organic EL display devices of the present invention, have the optimum Rth of the organic EL display device of Comparative Example 20 or Comparative Example 21, which is a conventional circularly polarizing plate, or a transparent support. It can be seen that the visibility under bright light is superior to those of the organic EL display devices of Comparative Examples 1 to 19 which are not adjusted to a proper value. The optical laminate used in the organic EL display device of the present invention can be produced by Roll to Roll, and an organic EL display device having excellent antireflection performance is high in addition to high productivity and excellent cost resistance. It becomes possible to provide with a yield. Furthermore, since the optically anisotropic layer containing DLC or RLC hardly changes in retardation due to temperature and humidity fluctuations, the organic EL display device of the present invention has a temperature of 0 ° C. to 30 ° C. and a humidity of 0%. In the range of ˜90%, no change in antireflection performance was visible.

The optical layered body of the present invention can be suitably used for antireflection of not only an organic EL display device but also a reflective liquid crystal display device, a transflective liquid crystal display device, a transparent display and the like. It can also be used as a brightness enhancement film by being installed on the backlight side of a liquid crystal display device. Furthermore, it can be used for applications such as optical disk pickups and PS conversion elements.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on a Japanese patent application filed on March 15, 2012 (Japanese Patent Application No. 2012-059351) and a Japanese patent application filed on October 4, 2012 (Japanese Patent Application No. 2012-222480). Is incorporated herein by reference.

1 TFT substrate 2 Back electrode 3 Organic layer including light emitting layer 4 Transparent or translucent electrode
5 Transparent substrate 6 Optical laminate 7 Polarizing plate

Claims

An organic EL display device comprising at least a polarizer layer, a λ / 2 plate, a λ / 4 plate, and an organic EL panel in this order, wherein the in-plane retardation Re2 (550) of the λ / 4 plate at 550 nm 115 ≦ Re2 (550) ≦ 155
And the in-plane retardation Re1 (550) at 550 nm of the λ / 2 plate is Re1 (550) = 2 × Re2 (550) ± 50 nm
An organic EL display device characterized by satisfying the above.
The angle formed by the absorption axis direction of the polarizer layer and the slow axis direction of the λ / 2 plate is −30 ° × Rth1 (550) / | Rth1 (550) | + 45 ° ± 8 °
And the angle formed by the absorption axis direction of the polarizer layer and the slow axis direction of the λ / 4 plate is 30 ° × Rth1 (550) / | Rth1 (550) | + 45 ° ± 8 °
The organic EL display device according to claim 1, wherein (However, Rth1 (550) is retardation in the thickness direction of the λ / 2 plate at a wavelength of 550 nm.)
3. The organic EL display device according to claim 2, wherein at least one of the λ / 2 plate and the λ / 4 plate is a layer containing either a discotic liquid crystal compound or a rod-like liquid crystal compound.
The sum of Rth at a wavelength of 550 nm of the layers between the polarizer layer and the λ / 2 plate and including the λ / 2 plate but not the polarizer layer is −150 nm to 150 nm. And the sum of Rth at a wavelength of 550 nm of all layers between the λ / 2 plate and the λ / 4 plate, including the λ / 4 plate but not the λ / 2 plate, is − The organic EL display device according to claim 3, wherein the organic EL display device has a thickness of 120 nm to 120 nm.
At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, a second transparent support layer composed of one or more layers, and a disco An organic EL display device comprising a λ / 4 plate composed of a layer containing a tick liquid crystal compound and an organic EL panel in this order, wherein the Rth of the first transparent support layer at a wavelength of 550 nm is −30 nm to 150 nm The organic EL display device according to claim 4, wherein Rth of the second transparent support layer at a wavelength of 550 nm is from 0 nm to 200 nm.
A λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a transparent support layer comprising one or more layers, a λ / 4 plate comprising a layer containing a discotic liquid crystal compound, and an organic EL panel The organic EL display device according to claim 4, wherein Rth at a wavelength of 550 nm of the transparent support layer is -10 nm to 140 nm.
At least a polarizer layer, a transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, a λ / 4 plate composed of a layer containing a discotic liquid crystal compound, and an organic EL panel 5. The organic EL display device according to claim 4, wherein Rth at a wavelength of 550 nm of the transparent support layer is −30 nm to 30 nm.
A λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a λ / 4 plate comprising a layer containing a discotic liquid crystal compound, a transparent support layer comprising one or more layers, and an organic EL panel The organic EL display device according to claim 4, wherein the transparent support layer has an Rth of -10 nm to 100 nm at a wavelength of 550 nm.
At least a polarizer layer, a transparent support layer comprising one or more layers, a λ / 2 plate comprising a layer containing a discotic liquid crystal compound, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, and an organic EL panel 5. The organic EL display device according to claim 4, wherein Rth at a wavelength of 550 nm of the transparent support layer is −50 nm to 150 nm.
A λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a transparent support layer comprising one or more layers, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, and an organic EL panel 5. The organic EL display device according to claim 4, wherein Rth at a wavelength of 550 nm of the transparent support layer is −90 nm to 50 nm.
A λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, a transparent support layer comprising one or more layers, an organic EL panel, The organic EL display device according to claim 4, wherein the transparent support layer has an Rth of −110 nm to 40 nm at a wavelength of 550 nm.
At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, a second transparent support layer composed of one or more layers, and a rod shape An organic EL display device comprising a λ / 4 plate composed of a layer containing a liquid crystal compound and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −40 nm to 140 nm, The organic EL display device according to claim 4, wherein Rth of the second transparent support layer at a wavelength of 550 nm is -70 nm to 70 nm.
At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, and a λ / 4 plate composed of a layer containing a discotic liquid crystal compound, An organic EL display device comprising a second transparent support layer composed of one or more layers and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −50 nm to 130 nm The organic EL display device according to claim 4, wherein Rth of the second transparent support layer at a wavelength of 550 nm is 0 nm to 100 nm.
At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a discotic liquid crystal compound, a λ / 4 plate composed of a layer containing a rod-like liquid crystal compound, and 1 An organic EL display device comprising a second transparent support layer composed of a plurality of layers and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −40 nm to 140 nm, The organic EL display device according to claim 4, wherein Rth of the second transparent support layer at a wavelength of 550 nm is -100 nm to 40 nm.
A λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a first transparent support layer comprising one or more layers, a λ / 4 plate comprising a layer containing a discotic liquid crystal compound, An organic EL display device including a second transparent support layer composed of one or more layers and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −40 nm to 150 nm The organic EL display device according to claim 4, wherein Rth of the second transparent support layer at a wavelength of 550 nm is -50 nm to 100 nm.
A λ / 2 plate comprising at least a polarizer layer, a layer containing a discotic liquid crystal compound, a first transparent support layer comprising one or more layers, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, and 1 An organic EL display device comprising a second transparent support layer comprising at least a layer and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −70 nm to 100 nm, The organic EL display device according to claim 4, wherein Rth of the second transparent support layer at a wavelength of 550 nm is -110 nm to 40 nm.
At least a polarizer layer, a transparent support layer comprising one or more layers, a λ / 2 plate comprising a layer containing a rod-like liquid crystal compound, a λ / 4 plate comprising a layer containing a discotic liquid crystal compound, and an organic EL panel The organic EL display device according to claim 4, wherein the transparent support layer has an Rth of −150 nm to 50 nm at a wavelength of 550 nm.
At least a polarizer layer, a transparent support layer comprising one or more layers, a λ / 2 plate comprising a layer containing a rod-like liquid crystal compound, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, and an organic EL panel 5. The organic EL display device according to claim 4, wherein Rth at a wavelength of 550 nm of the transparent support layer is −30 nm to 30 nm.
A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a transparent support layer comprising one or more layers, a λ / 4 plate comprising a layer containing a discotic liquid crystal compound, and an organic EL panel The organic EL display device according to claim 4, wherein Rth of the transparent support layer at a wavelength of 550 nm is -50 nm to 90 nm.
A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a transparent support layer comprising one or more layers, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, and an organic EL panel 5. The organic EL display device according to claim 4, wherein the transparent support layer has an Rth of −140 nm to 10 nm at a wavelength of 550 nm.
A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a λ / 4 plate comprising a layer containing a discotic liquid crystal compound, a transparent support layer comprising one or more layers, an organic EL panel, The organic EL display device according to claim 4, wherein the transparent support layer has an Rth of -50 nm to 110 nm at a wavelength of 550 nm.
A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, a transparent support layer comprising one or more layers, and an organic EL panel 5. The organic EL display device according to claim 4, wherein the transparent support layer has an Rth of −100 nm to 10 nm at a wavelength of 550 nm.
At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-like liquid crystal compound, a second transparent support layer composed of one or more layers, and a discotic An organic EL display device comprising a λ / 4 plate comprising a layer containing a liquid crystal compound and an organic EL panel in this order, wherein the first transparent support layer has an Rth of −140 nm to 40 nm at a wavelength of 550 nm, The organic EL display device according to claim 4, wherein Rth of the second transparent support layer at a wavelength of 550 nm is -70 nm to 70 nm.
At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-shaped liquid crystal compound, a second transparent support layer composed of one or more layers, and a rod-shaped liquid crystal An organic EL display device comprising a λ / 4 plate comprising a layer containing a compound and an organic EL panel in this order, wherein Rth of the first transparent support layer at a wavelength of 550 nm is −150 nm to 40 nm, The organic EL display device according to claim 4, wherein Rth of the second transparent support layer at a wavelength of 550 nm is -200 nm to 0 nm.
At least a polarizer layer, a first transparent support layer composed of one or more layers, a λ / 2 plate composed of a layer containing a rod-like liquid crystal compound, a λ / 4 plate composed of a layer containing a discotic liquid crystal compound, and 1 An organic EL display device comprising a second transparent support layer comprising at least a layer and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −140 nm to 40 nm, The organic EL display device according to claim 4, wherein Rth of the second transparent support layer at a wavelength of 550 nm is -40 nm to 100 nm.
At least a polarizer layer, a first transparent support layer comprising one or more layers, a λ / 2 plate comprising a layer containing a rod-like liquid crystal compound, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, and one layer An organic EL display device comprising the above-described second transparent support layer and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −120 nm to 40 nm, The organic EL display device according to claim 4, wherein Rth of the second transparent support layer at a wavelength of 550 nm is from -100 nm to 0 nm.
A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a first transparent support layer comprising one or more layers, a λ / 4 plate comprising a layer containing a discotic liquid crystal compound, and 1 An organic EL display device comprising a second transparent support layer composed of at least a layer and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is -100 nm to 80 nm, The organic EL display device according to claim 4, wherein Rth of the second transparent support layer at a wavelength of 550 nm is -40 nm to 100 nm.
A λ / 2 plate comprising at least a polarizer layer, a layer containing a rod-like liquid crystal compound, a first transparent support layer comprising one or more layers, a λ / 4 plate comprising a layer containing a rod-like liquid crystal compound, and one layer An organic EL display device comprising the above-described second transparent support layer and an organic EL panel in this order, wherein Rth at a wavelength of 550 nm of the first transparent support layer is −150 nm to 40 nm, The organic EL display device according to claim 4, wherein Rth of the second transparent support layer at a wavelength of 550 nm is from -100 nm to 50 nm.
The organic EL display device according to any one of claims 1 to 28, comprising at least one cellulose acylate layer between the polarizer layer and the organic EL panel.